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picorv32
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Progress in "make check"

This commit is contained in:
Clifford Wolf 2015-10-15 15:45:19 +02:00
parent 07f28068f6
commit 8eaeebf486
2 changed files with 31 additions and 13 deletions
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4
Makefile
View File

@ -15,8 +15,8 @@ view: testbench.vcd
gtkwave $< testbench.gtkw
check: check.smt2
# yosys-smtbmc -m picorv32 check.smt2
yosys-smtbmc -m picorv32 -t 10 -c check.vcd -i check.smt2
yosys-smtbmc -t 30 -c check.vcd check.smt2
yosys-smtbmc -t 30 -c check.vcd -i check.smt2
check.smt2: picorv32.v
yosys -v2 -p 'read_verilog -formal picorv32.v' \

40
picorv32.v
View File

@ -27,6 +27,11 @@
`define debug(debug_command)
`endif
`ifdef FORMAL
`define FORMAL_KEEP (* keep *)
`else
`define FORMAL_KEEP
`endif
/***************************************************************
* picorv32
@ -304,9 +309,9 @@ module picorv32 #(
assign is_rdcycle_rdcycleh_rdinstr_rdinstrh = |{instr_rdcycle, instr_rdcycleh, instr_rdinstr, instr_rdinstrh};
reg [63:0] new_ascii_instr;
reg [63:0] ascii_instr;
`FORMAL_KEEP reg [63:0] ascii_instr;
always @* begin
always @(posedge clk) begin
new_ascii_instr = "";
if (instr_lui) new_ascii_instr = "lui";
if (instr_auipc) new_ascii_instr = "auipc";
@ -363,7 +368,7 @@ module picorv32 #(
if (instr_timer) new_ascii_instr = "timer";
if (decoder_trigger_q)
ascii_instr = new_ascii_instr;
ascii_instr <= new_ascii_instr;
end
always @(posedge clk) begin
@ -402,9 +407,7 @@ module picorv32 #(
end
if (decoder_trigger && !decoder_pseudo_trigger) begin
if (WITH_PCPI) begin
pcpi_insn <= mem_rdata_q;
end
pcpi_insn <= WITH_PCPI ? mem_rdata_q : 'bx;
instr_beq <= is_beq_bne_blt_bge_bltu_bgeu && mem_rdata_q[14:12] == 3'b000;
instr_bne <= is_beq_bne_blt_bge_bltu_bgeu && mem_rdata_q[14:12] == 3'b001;
@ -511,7 +514,7 @@ module picorv32 #(
reg [7:0] cpu_state;
reg [1:0] irq_state;
reg [127:0] ascii_state;
`FORMAL_KEEP reg [127:0] ascii_state;
always @* begin
ascii_state = "";
@ -1097,18 +1100,33 @@ module picorv32 #(
// Formal Verification
`ifdef FORMAL
reg [3:0] cycle = 0;
always @(posedge clk)
if (~&cycle) cycle <= cycle + 1;
always @(posedge clk) begin
if (~&cycle)
cycle <= cycle + 1;
end
reg [4:0] last_mem_ready;
always @(posedge clk)
last_mem_ready <= {last_mem_ready, mem_ready};
assume property (|last_mem_ready);
reg ok;
always @* begin
assume (resetn == |cycle);
if (cycle) begin
// instruction fetches are read-only
if (mem_valid && mem_instr)
assert (mem_wstrb == 0);
// cpu_state must be valid
ok = 0;
if (cpu_state == cpu_state_trap) ok = 1;
if (cpu_state == cpu_state_fetch) ok = 1;
if (cpu_state == cpu_state_ld_rs1) ok = 1;
if (cpu_state == cpu_state_ld_rs2) ok = ENABLE_REGS_DUALPORT;
if (cpu_state == cpu_state_exec) ok = 1;
if (cpu_state == cpu_state_shift) ok = 1;
if (cpu_state == cpu_state_stmem) ok = 1;
if (cpu_state == cpu_state_ldmem) ok = 1;
assert (ok);
end
end
`endif